Very sad news.
Agreed, R4, Live8 was a momentous occasion for all Floyd fans.
I was lucky enough to see him play, alongside Nick Mason, on David Gilmour's 2006 tour at the Albert Hall. Despite being a Roger short of the full set, they played the most breathtaking rendition of 'Echoes' - such a priviledge to be able to have heard this live.
RIP Rick.